#include"my_stdio.h"
#include<stdio.h>
#include<string.h>
int main()
{
    mFILE*fp=mfopen("./log.txt","w");
    if(fp==NULL) return 1;
    char *str="hello world\n";
    mfwrite(str,strlen(str),fp);
    mfclose(fp);
    return 0;
}
